# Authentication

All API calls are authenticated by providing your API key in the `X-API-Key` header.

## Accessing Your API Key

1. Log in to your account at https://app.useonward.com
2. Navigate to the Onward API tab in your account settings
3. Copy your API Key and store it securely


API Key tab of account settings
This API key is a secret and should only be used for server-to-server communication.

## Example Request


```bash
curl --request POST \
     --url https://app.useonward.com/api/v1/orders \
     --header 'X-API-Key: YOUR_API_KEY_HERE' \
     ...
```

*Replace `YOUR_API_KEY_HERE` with your actual key.*

## Testing

See [Testing](/topics/testing) for information about Test API Keys.